code: def test_dhash_length(self):
      self.check_hash_length(self.func, self.image)
  
file_path: imagehash/tests/test_dhash.py
imports: from __future__ import absolute_import, division, print_function
  import unittest
  import imagehash
  from .utils import TestImageHash
label_desc: Use image node_id 3 for calling the Test obj's underlying member method code with example usage: obj.test_dhash_length() without return types